Vegetable Spacing Chart for 30-Inch Beds

A vegetable spacing chart is a yield sheet, not a courtesy on the packet. In-row spacing times the number of rows on the bed is how many units you cut. Change either number and you change the harvest. The bed width is the part that should stop moving.

One bed width

The tools are built for 30-inch beds. That width is the constant. Row count is how many lines fit across it. In-row spacing is how far apart the plants sit on each line. Units per bed-foot fall out of those two numbers. You do not pick a spacing and then invent a bed to match it.

Two hundred sixteen market-vegetable cultivars carry their own row count and in-row spacing. A lettuce bed is not a tomato bed. A carrot bed is not a brassica bed. The chart you want is the cultivar sheet, not one number for “vegetables.”

What tight spacing buys

Tighter in-row spacing puts more plants on the same bed-foot. More plants is more units, until the plants start sharing light and water past the point where each unit still makes grade. On leaf crops, a tighter line also closes the canopy sooner. Closed canopy is weed suppression. You hoe less because the soil does not see sun.

Between-row spacing does the same job across the bed. More rows on 30 inches is more units, and a faster shade on the shoulders. That is the yield decision. It is also the weeding decision. A bed that closes in three weeks does not get a fourth cultivation.

What tight spacing costs

Airflow is the cost. Plants that touch hold moisture on the leaf. Moisture on the leaf is the start of the disease you will spray or cull. A heading crop packed past its sheet spacing makes small heads and more rot in the heart. A fruiting crop packed past its sheet spacing makes a hedge. You pick less, and you pick wetter fruit.

Tight spacing also spends water and fertility on plants that will not all make a sellable unit. The extra seed is not the loss. The loss is bed-feet tied up in culls. Spacing is how you decide which plants get to finish.

How to read the chart

Read it as two numbers, then a product. Rows across the 30-inch bed. In-row spacing on each row. Units per bed-foot is the product. Yield per bed-foot is that count times the unit weight or the unit count the sheet already holds.

Do not average across a crop family. Salanova and a full-size romaine are both lettuce. They are not the same row count. A cherry tomato and a beefsteak are both solanum. They are not the same in-row spacing. Use the cultivar line.

If you tighten past the sheet, write down what you are buying. More units, faster canopy, less hoe time. Then write down what you are spending. Air, disease pressure, grade. If you cannot name both sides, you are guessing.

Succession does not change the spacing. A second sowing of the same cultivar uses the same row count and the same in-row figure. What changes is the date, not the geometry. Do not “give them more room” on a late sowing to make up for a short season. You will cut fewer units on a bed that still closes late.

Where the numbers live

Packet spacing assumes a row in open ground. A 30-inch bed with a set row count is a different geometry. The in-row figure and the row count have to be read together or the chart lies.